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Re: WCNG - Upgrading working copies

From: Mark Phippard <markphip_at_gmail.com>
Date: Fri, 26 Nov 2010 08:58:48 -0500

On Fri, Nov 26, 2010 at 8:02 AM, Stefan Sperling <stsp_at_elego.de> wrote:
> On Fri, Nov 26, 2010 at 02:05:55PM +1000, Daniel Becroft wrote:
>> Hi,
>>
>> I'm currently trialling the nightly builds that Stefan is providing for
>> TSVN, which include the new WCNG implementation. So far, it all looks good.
>> It takes a few minutes extra to checkout a working copy, but the day-to-day
>> performance difference (to me) is not noticeable. Good stuff!
>>
>> One thing I did notice, though, is the performance of the 'svn upgrade'
>> functionality. It seems to take, on average, 3x longer to upgrade an
>> existing working copy than to just delete and checkout again.
>>
>> Checkout (1.6.x): 9 minutes
>> Checkout (1.7.x): 14 minutes
>> Upgrade (1.7.x): 43 minutes
>>
>> Is this kind of performance hit during an upgrade expected? Is the
>> recommended upgrade option expected to be to use 'svn upgrade' or do get a
>> fresh checkout?
>>
>> If you need stats regarding the working copy, I can provide them.
>
> Please keep benchmarking and reporting your results.
> The current state of wc-ng development is, AFAIK, that we're still
> working out some final steps in the implementation. We're not yet at
> the point where we're heavily trying to optimize the new code.
> But any report about slowness will help once we've reached that point.
> Keep them coming.

It seems like Daniel is more asking if this might be indicative of a
bug. Does it ever make sense that svn upgrade would take that long?
Without any need to fetch pristines from the repository as checkout
needs to do, it seems hard to believe that it should take that long.
I can imagine scenarios where we have to calc new checksums or open
and re-read entry data over and over again but 43 minutes?

Daniel, is your working copy on a local hard drive?

-- 
Thanks
Mark Phippard
http://markphip.blogspot.com/
Received on 2010-11-26 14:59:27 CET

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